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World of Warcraft exploiters wipe out entire cities

Imagine logging into your favorite MMO only to find that a previously populated capital city is a barren wasteland devoid of life. This actually happened yesterday to some denizens of World of Warcraft, as mischief-makers used an exploit to kill everyone -- human players and NPCs alike -- in the biggest cities. Stormwind and Orgrimmar were completely wiped out on several servers, with other towns reportedly coming under nefarious attacks.
Blizzard leaped into action and quickly hotfixed the game, promising that the exploit cannot happen again. The studio said that it is taking this apocalypse action "very seriously" and has launched an investigation into it.